کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1285481 973144 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Bi2O3 content on characteristics of Bi2O3–GDC systems for direct methane oxidation
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Effect of Bi2O3 content on characteristics of Bi2O3–GDC systems for direct methane oxidation
چکیده انگلیسی

Ceramic systems of Bi2O3 and gadolinia-doped ceria (GDC) solid mixture were prepared as catalysts for direct methane oxidation. These systems were characterized by temperature-programmed reduction using hydrogen and carbon monoxide, temperature-programmed reaction of methane, fixed-temperature direct methane oxidation, and X-ray diffraction analysis. Adding Bi2O3 to GDC promotes both hydrogen and CO oxidation activities, because of the presence of surface Bi2O3 and the high content of mobile oxygen in Bi2O3. The reactivity of CO with surface lattice oxygen is enhanced to a higher extent than that of H2, and this enhanced extent shows a maximum in Bi2O3 content. Such a maximum also exists for the catalytic activity of direct methane oxidation. A synergistic effect occurs due to a combination of the high methane reactivity of GDC and the high content of mobile oxygen in Bi2O3. The CO2 selectivity of direct methane oxidation can be modulated by varying the Bi2O3 content. The mixing of Bi2O3 with GDC also increases the self-de-coking capability of the catalyst during direct methane oxidation, which stabilizes the activity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 181, Issue 1, 15 June 2008, Pages 62–68
نویسندگان
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